BASIS OF PRESENTATION (Policies)	6 Months Ended
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The unaudited interim Consolidated Financial Statements, including the Notes presented in this document, have been prepared in accordance with GAAP interim reporting requirements and, therefore, do not include all information and Notes included in the audited Consolidated Financial Statements in conformity with GAAP. The unaudited interim Consolidated Financial Statements and Notes presented in this document should be read in conjunction with the Company’s audited Consolidated Financial Statements and accompanying Notes included in the Company’s 2022 Form 10-K. The Company’s principal business activity is banking, conducted through its subsidiary CBNA.
Consolidation	The unaudited interim Consolidated Financial Statements include the accounts of Citizens and its subsidiaries, and VIEs in which Citizens has been determined to be the primary beneficiary. All intercompany transactions and balances have been eliminated. The unaudited interim Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year.
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the ACL.
Credit Quality Indicators	The Company presents loan and lease portfolio segments and classes by credit quality indicator and vintage year. Citizens defines the vintage date for the purpose of this disclosure as the date of the most recent credit decision. Renewals are categorized as new credit decisions and reflect the renewal date as the vintage date, except for renewals of loans modified for borrowers experiencing financial difficulty, or FDMs, which are presented in the original vintage. Citizens utilizes regulatory classification ratings to monitor credit quality for commercial loans and leases. For more information on regulatory classification ratings see Note 6 in the Company’s 2022 Form 10-K. For retail loans, Citizens utilizes FICO credit scores and the loan’s payment and delinquency status to monitor credit quality. Management believes FICO scores are the strongest indicator of credit losses over the contractual life of the loan and assist management in predicting the borrower’s future payment performance. Scores are based on current and historical national industry-wide consumer level credit performance data.
Variable Interest Entity	Citizens, in the normal course of business, engages in a variety of activities with entities that are considered VIEs, as defined by GAAP, with its variable interest arising from contractual, ownership or other monetary interests in the entity. A VIE typically does not have sufficient equity at risk to finance its activities without additional subordinated financial support from other parties. Citizens is the primary beneficiary of a VIE, and must consolidate it, if its variable interest provides it with the power to direct the activities that significantly impact the VIE and it has the right to receive benefits, or the obligation to absorb losses, that could potentially be significant to the VIE. Citizens considers both qualitative and quantitative factors regarding the nature, size and form of its involvement with the VIE to determine whether or not a variable interest held is significant to the VIE. Citizens assesses whether or not it is the primary beneficiary of a VIE on an ongoing basis. Transfers of financial assets in which the Company has not surrendered control over the transferred assets are accounted for as a secured borrowing with a pledge of collateral. Control is generally considered surrendered when 1) the transferred assets are legally isolated from the Company and its creditors, even in bankruptcy, 2) the transferee has the right to pledge or exchange the transferred assets it received, with no condition that constrains the transferee from taking advantage of this right or that provides more than a trivial benefit to the Company, and 3) the Company does not maintain effective control over the transferred financial assets. Judgment is required to assess whether the Company maintains effective control over transferred financial assets.

BASIS OF PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The unaudited interim Consolidated Financial Statements, including the Notes presented in this document, have been prepared in accordance with GAAP interim reporting requirements and, therefore, do not include all information and Notes included in the audited Consolidated Financial Statements in conformity with GAAP. The unaudited interim Consolidated Financial Statements and Notes presented in this document should be read in conjunction with the Company’s audited Consolidated Financial Statements and accompanying Notes included in the Company’s 2022 Form 10-K. The Company’s principal business activity is banking, conducted through its subsidiary CBNA.

Consolidation

The unaudited interim Consolidated Financial Statements include the accounts of Citizens and its subsidiaries, and VIEs in which Citizens has been determined to be the primary beneficiary. All intercompany transactions and balances have been eliminated. The unaudited interim Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the ACL.

Credit Quality Indicators

The Company presents loan and lease portfolio segments and classes by credit quality indicator and vintage year. Citizens defines the vintage date for the purpose of this disclosure as the date of the most recent credit decision. Renewals are categorized as new credit decisions and reflect the renewal date as the vintage date, except for renewals of loans modified for borrowers experiencing financial difficulty, or FDMs, which are presented in the original vintage.

Citizens utilizes regulatory classification ratings to monitor credit quality for commercial loans and leases. For more information on regulatory classification ratings see Note 6 in the Company’s 2022 Form 10-K.

For retail loans, Citizens utilizes FICO credit scores and the loan’s payment and delinquency status to monitor credit quality. Management believes FICO scores are the strongest indicator of credit losses over the contractual life of the loan and assist management in predicting the borrower’s future payment performance. Scores are based on current and historical national industry-wide consumer level credit performance data.

Variable Interest Entity

Citizens, in the normal course of business, engages in a variety of activities with entities that are considered VIEs, as defined by GAAP, with its variable interest arising from contractual, ownership or other monetary interests in the entity. A VIE typically does not have sufficient equity at risk to finance its activities without additional subordinated financial support from other parties. Citizens is the primary beneficiary of a VIE, and must consolidate it, if its variable interest provides it with the power to direct the activities that significantly impact the VIE and it has the right to receive benefits, or the obligation to absorb losses, that could potentially be significant to the VIE. Citizens considers both qualitative and quantitative factors regarding the nature, size and form of its involvement with the VIE to determine whether or not a variable interest held is significant to the VIE. Citizens assesses whether or not it is the primary beneficiary of a VIE on an ongoing basis.

Transfers of financial assets in which the Company has not surrendered control over the transferred assets are accounted for as a secured borrowing with a pledge of collateral. Control is generally considered surrendered when 1) the transferred assets are legally isolated from the Company and its creditors, even in bankruptcy, 2) the transferee has the right to pledge or exchange the transferred assets it received, with no condition that constrains the transferee from taking advantage of this right or that provides more than a trivial benefit to the Company, and 3) the Company does not maintain effective control over the transferred financial assets. Judgment is required to assess whether the Company maintains effective control over transferred financial assets.